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<b>“DigitalOcean supports postGIS?”</b>
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<br>Generally speaking, D.O. does not support individual software programs or packages. According to its FAQs, D.O. only provides a “platform developed for developers who need to launch and scale their applications quickly.”
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<br>To that end, D.O. does provide CentOS images, among others, for developers to build their droplets from. According to the website you provided, PostGIS is available for various operating systems; and CentOS is one of those operating systems.
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<br><b>“how do I install it?”</b>
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<br>Install instructions are available @ http://postgis.net/install
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